Some question about the Maxwell needle method experiment.

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SUMMARY

The discussion focuses on the Maxwell needle method and its relationship to torsional rigidity, specifically the formula for torsional rigidity given by c=∏nr^4/(2L). The participants seek clarification on the derivation of this formula, the significance of the rigidity modulus (n), and the distinction between rigidity modulus and Young's modulus. Additionally, the conversation compares the Maxwell needle method with the torsional pendulum for calculating rigidity modulus, evaluating their effectiveness in experimental applications.

PREREQUISITES
  • Understanding of torsional rigidity and its formula
  • Familiarity with Maxwell's needle method
  • Knowledge of Young's modulus and rigidity modulus
  • Basic principles of torsional pendulums
NEXT STEPS
  • Research the derivation of the torsional rigidity formula c=∏nr^4/(2L)
  • Study the principles and applications of the Maxwell needle method
  • Explore the differences between rigidity modulus and Young's modulus
  • Investigate the experimental setup and methodology of torsional pendulums
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Physics students, educators, and researchers interested in experimental mechanics and the properties of materials, particularly in the context of torsional rigidity measurements.

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Homework Statement


1)How do we obtain the formula of torsional rigidity ,c=∏nr^4/(2L) ?From experiment? then how do the ∏ come from? How do they know the n here is the rigidity modulus? Why it is not the young's modulus?
2)Is Maxwell needle method same as the torsional pendulum? Both can be used to calculate rigidity modulus of a wire. Which is better ? Why?

Homework Equations


The Attempt at a Solution


http://scienceworld.wolfram.com/physics/TorsionalPendulum.html
I have tried to google and get some reference book but nothing about these .
Guide will do . At least please tell me ways to get torsional rigidity. Just the name of experiment will do. Thank you
 
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What is the standerd value of modulus of regidity of a maxwell's needle
 

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